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DTLS as a Transport Layer for RADIUS
draft-ietf-radext-dtls-10

Document type: Active Internet-Draft (radext WG)
Document stream: IETF
Last updated: 2014-04-16
Intended RFC status: Experimental
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Unknown
Document shepherd: Jouni Korhonen
Shepherd Write-Up: Last changed 2014-03-31

IESG State: In Last Call (ends 2014-04-30)
IANA Review State: IANA - Review Needed
IANA Action State: None
Responsible AD: Benoit Claise
Send notices to: radext-chairs@tools.ietf.org, draft-ietf-radext-dtls@tools.ietf.org

Network Working Group                                         Alan DeKok
INTERNET-DRAFT                                                FreeRADIUS
Category: Experimental
<draft-ietf-radext-dtls-10.txt>
Expires: October 15, 2015
16 April 2014

                  DTLS as a Transport Layer for RADIUS
                       draft-ietf-radext-dtls-10

Abstract

   The RADIUS protocol defined in RFC 2865 has limited support for
   authentication and encryption of RADIUS packets.  The protocol
   transports data in the clear, although some parts of the packets can
   have obfuscated content.  Packets may be replayed verbatim by an
   attacker, and client-server authentication is based on fixed shared
   secrets.  This document specifies how the Datagram Transport Layer
   Security (DTLS) protocol may be used as a fix for these problems.  It
   also describes how implementations of this proposal can co-exist with
   current RADIUS systems.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on October 15, 2014

Copyright Notice

DeKok, Alan                   Experimental                      [Page 1]
INTERNET-DRAFT    DTLS as a Transport Layer for RADIUS     16 April 2014

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info/) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

DeKok, Alan                   Experimental                      [Page 2]
INTERNET-DRAFT    DTLS as a Transport Layer for RADIUS     16 April 2014

Table of Contents

1.  Introduction .............................................    4
   1.1.  Terminology .........................................    4
   1.2.  Requirements Language ...............................    5
   1.3.  Document Status .....................................    5
2.  Building on Existing Foundations .........................    7
   2.1.  Changes to RADIUS ...................................    7
   2.2.  Similarities with RADIUS/TLS ........................    8
      2.2.1.  Changes from RADIUS/TLS to RADIUS/DTLS .........    8
3.  Interaction with RADIUS/UDP ..............................    9
   3.1.  DTLS Port and Packet Types ..........................   10
   3.2.  Server Behavior .....................................   10
4.  Client Behavior ..........................................   11
5.  Session Management .......................................   11
   5.1.  Server Session Management ...........................   12
      5.1.1.  Session Opening and Closing ....................   12
   5.2.  Client Session Management ...........................   14
6.  Implementation Guidelines ................................   15
   6.1.  Client Implementations ..............................   16
   6.2.  Server Implementations ..............................   17
7.  Diameter Considerations ..................................   17
8.  IANA Considerations ......................................   17
9.  Implementation Status ....................................   18
   9.1.  Radsecproxy .........................................   18
   9.2.  jradius .............................................   18
10.  Security Considerations .................................   19
   10.1.  Crypto-Agility .....................................   19
   10.2.  Legacy RADIUS Security .............................   20
   10.3.  Resource Exhaustion ................................   21
   10.4.  Client-Server Authentication with DTLS .............   21

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